From patchwork Wed Feb 1 16:22:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring \(Arm\)" X-Patchwork-Id: 649362 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8A5CC636CD for ; Wed, 1 Feb 2023 16:23:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230214AbjBAQXC (ORCPT ); Wed, 1 Feb 2023 11:23:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230032AbjBAQXB (ORCPT ); Wed, 1 Feb 2023 11:23:01 -0500 Received: from mail-ot1-f50.google.com (mail-ot1-f50.google.com [209.85.210.50]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 796B87692; Wed, 1 Feb 2023 08:22:59 -0800 (PST) Received: by mail-ot1-f50.google.com with SMTP id d21-20020a056830005500b0068bd2e0b25bso2674381otp.1; Wed, 01 Feb 2023 08:22:59 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=R40wPAUHV11BoLIxg3n5Gsakpb6u6fji29HG4MLTY4o=; b=ZvFFJCwwwAO5Fw1Nns7IPmazHQaJlzIN9/v1oCydo0HvK7kY0RFIwhQSjjgLZyuJUm MHDmgz5GNcbNktx5xPlpIu2l1f4NBkvb+URZ8qxz3Rvcepk2lTmCJ/WAhTLGmPsgHF7Q 1IfjrzDjFi1pwHlZzpfJa01GFKX8/37Wr58d/8WVm6sAxnOrgHUDL9unIDpPXKwwn6uS 80R03qbbTubUAhFTVirhAhrbuMTB2IYJo6oQDEHIQMHANXYfiXMr/iuux9Eh6jpQtcX2 zoFLPbURJh/4obhdvufupXmM8lnkWY4UQMFiJYzqto4qbbzKwuQ2cD1upj3DXfAVDddu Z1XA== X-Gm-Message-State: AO0yUKXxX/LsCcy/EpEGHYSaUpA5CSE+mbVcJVAxeuryhNXmJDYu4Px3 uk999iDhSLi77v+oWvmhI7tKHEClTw== X-Google-Smtp-Source: AK7set/UX1tfLsIgf/HC8D7E26Rttu7INRWLZgG9CGpFRsZtZJmjwG0t2Ty7lv8janpvOOJu5kq1nA== X-Received: by 2002:a05:6830:2b1f:b0:68b:c04d:79ca with SMTP id l31-20020a0568302b1f00b0068bc04d79camr2413569otv.33.1675268578345; Wed, 01 Feb 2023 08:22:58 -0800 (PST) Received: from robh_at_kernel.org (66-90-144-107.dyn.grandenetworks.net. [66.90.144.107]) by smtp.gmail.com with ESMTPSA id c20-20020a9d6854000000b006864ccdb053sm5694860oto.26.2023.02.01.08.22.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Feb 2023 08:22:58 -0800 (PST) Received: (nullmailer pid 3575712 invoked by uid 1000); Wed, 01 Feb 2023 16:22:57 -0000 From: Rob Herring To: Frank Rowand , Javier Martinez Canillas , Thomas Zimmermann Cc: Michal Suchanek , linuxppc-dev@lists.ozlabs.org, "Erhard F ." , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4] of: Make OF framebuffer device names unique Date: Wed, 1 Feb 2023 10:22:47 -0600 Message-Id: <20230201162247.3575506-1-robh@kernel.org> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Michal Suchanek Since Linux 5.19 this error is observed: sysfs: cannot create duplicate filename '/devices/platform/of-display' This is because multiple devices with the same name 'of-display' are created on the same bus. Update the code to create numbered device names for the displays. Also, fix a node refcounting issue when exiting the boot display loop. cc: linuxppc-dev@lists.ozlabs.org References: https://bugzilla.kernel.org/show_bug.cgi?id=216095 Fixes: 52b1b46c39ae ("of: Create platform devices for OF framebuffers") Reported-by: Erhard F. Suggested-by: Thomas Zimmermann Signed-off-by: Michal Suchanek Link: https://lore.kernel.org/r/20230120180958.30798-1-msuchanek@suse.de [robh: Rework to avoid node refcount leaks] Signed-off-by: Rob Herring --- drivers/of/platform.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 81c8c227ab6b..b3878a98d27f 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -525,6 +525,7 @@ static int __init of_platform_default_populate_init(void) if (IS_ENABLED(CONFIG_PPC)) { struct device_node *boot_display = NULL; struct platform_device *dev; + int display_number = 0; int ret; /* Check if we have a MacOS display without a node spec */ @@ -555,16 +556,23 @@ static int __init of_platform_default_populate_init(void) if (!of_get_property(node, "linux,opened", NULL) || !of_get_property(node, "linux,boot-display", NULL)) continue; - dev = of_platform_device_create(node, "of-display", NULL); + dev = of_platform_device_create(node, "of-display.0", NULL); + of_node_put(node); if (WARN_ON(!dev)) return -ENOMEM; boot_display = node; + display_number++; break; } for_each_node_by_type(node, "display") { + char buf[14]; + const char *of_display_format = "of-display.%d"; + if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) continue; - of_platform_device_create(node, "of-display", NULL); + ret = snprintf(buf, sizeof(buf), of_display_format, display_number++); + if (ret < sizeof(buf)) + of_platform_device_create(node, buf, NULL); } } else {